Look. Lets be real about this sort of thing. There are three different aspects to power in an engine, yes? 1. Fuel Metering 2. Gas Flow 3. Compression/Spark/Combustion Efficiency. Everything to do with the engine's BASE POWER OUTPUT has to do with those three things. What is the most signifigant power change? Well if you do things systemically, then you will have more than the sum of each individual change. But if, like the majority of us, you can only do one thing at a time for $ and time reasons, then do the thing which will benefit you the most with the least negative aspects. Carbs are Fuel Metering. Head porting, exhaust systems, intake manifold runners, cams as well, these are all Gas Flow items. Dual spark heads, higher compression, higher power coils, these are Combustion Efficiency items. Any thing you do, you will be realizing more power. But some things go together. Increasing intake air flow will not help a huge amount unless you increase exhaust. Which will require fuel delivery changes, for more air is now being flowed. Air box mods, etc. Same for increasing cc size. So you are automatically into systemic changes. Seems to me that unless you really want to get into that, the most effective ways to increase power without going into changes of other things would be mainly Combusion Efficiency items. Seems to me, if you are going conservatively, without wanting to do a huge amount of work to your bike and reducing negative effects, you will want to do one thing mainly, and that is increasing compression ratio. Compression will increase power from the flow you are already getting. There is not a negative except a heavier starter load. You will not have to give up a choke. You will not have to worry about resale, because it is cosmetically the same. It is systemically independent, so no other mods are required to maximize potential. Of course, you also must realize that you will be limiting what you could have done with the same amount of work if you WERE to do later systemic changes. But for me, 80 hp is plenty, and I'm not competing with SBK's, because you could just go out and buy one for the amount you would have to spend to make your bike do what they do. So there's my from experience.

Sam